參數(shù)資料
型號(hào)： LT1941
廠(chǎng)商： Linear Technology Corporation
英文描述： Triple Monolithic Switching Regulator
中文描述： 三單片開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 328K
代理商： LT1941
1
LT1941
1941f
Triple Monolithic
Switching Regulator
DESCRIPTIOU
I
Wide Input Range: 3.5V to 25V
I
Three Switching Regulators with Internal Power
Switches: 3A Step-Down, 2A Step-Down,
1.5A Inverting/Boost
I
Antiphase Switching Reduces Ripple
I
Independent Shutdown/Soft-Start Pins
I
Independent Power Good Indicators Ease Supply
Sequencing
I
Input Voltage Power Good Indicators Monitor Input
Supply
I
Uses Small Inductors and Ceramic Capacitors
I
Constant 1.1MHz Switching Frequency
I
Thermally Enhanced 28-Lead TSSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
Cable Modems
I
DSL Modems
I
Distributed Power Regulation
I
Wall Transformer Regulation
I
Disk Drives
I
DSP Power
The LT
1941 is a triple current mode DC/DC converter
with internal power switches. Two of the regulators are
step-down converters with 3A and 2A power switches.
The third regulator can be configured as a boost, inverter
or SEPIC converter and has a 1.5A power switch. All three
converters are synchronized to a 1.1MHz oscillator. The
two step-down converters run with opposite phases,
reducing input ripple current. The output voltages are set
with external resistor dividers and each regulator has
independent shutdown and soft-start circuits. Each regu-
lator generates a power good signal when its output is in
regulation, easing power supply sequencing and interfac-
ing with microcontrollers and DSPs.
The high switching frequency offers several advantages
by permitting the use of small inductors and ceramic
capacitors. Small inductors and capacitors lead to a very
small triple output solution. The constant switching fre-
quency, combined with low impedance ceramic capaci-
tors, result in low, predictable output ripple. With its wide
input voltage range of 3.5V to 25V, the LT1941 regulates
a broad array of power sources from 4-cell batteries and
5V logic rails to unregulated wall transformers, lead acid
batteries and distributed-power supplies.
Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V
RUN/SS
2V/DIV
V
2V/DIV
V
5V/DIV
V
10V/DIV
I
VIN(AVE)
PGOOD2
5V/DIV
1941 F01b
Start-Up Waveforms
with Sequencing
V
OUT2
V
OUT1
LT1941
GND
0.22
μ
F
22
μ
F
1000pF
1.5nF
1.5nF
3300pF
13.7k
133k
2.49k
10k
V
IN
4.7V TO 14V
5GOOD
12GOOD
V
OUT1
2.4A
V
OUT3
*
350mA
3.3
μ
H
3
μ
H
22
μ
H
22
μ
H
10.7k
13.7k
7.32k
3.3k
1.5k
1941 F01
130k
100k
100k
100k
100k
PGOOD1
PGOOD2
PGOOD3
V
3.3V
1.4A
0.22
μ
F
33
μ
F
1
μ
F
10
μ
F
*240mA AT V
IN
= 5V, 550mA AT V
IN
= 12V
10
μ
F
22nF
PGOOD1
PGOOD2
PGOOD3
BOOST2
SW2
FB2
V
C2
SW1
FB1
V
C1
RUNSS2
BIAS1
BIAS2
V
C3
RUNSS3
RUNSS1
SW3
NFB
FB3
5GOOD
12GOOD
BOOST1
1.5nF
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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LT1941EFE 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱(chēng):AS1323-BTTT-30CT
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